http://www.ebay.com/itm/Gm-10-Bolt-Posi-...e14&vxp=mtr

I gave a link to an ebay item that looks similiar. It looks like an 8.5 gm posi that came in alot of 90's gm vehicles. I pulled one of those out of a 1996 impala ss in a local pic a part last year.